I know the best kind are the ones which would be wired into the system, but saw this today and wondered if it would be any good. Is this a "better than nothing" or "you get what you pay for" situation...
Look around, maybe you can find a discontinued model, the 34520 was discontinued so they are discounted pretty good. Got mine for $141. It will not connect power until it verifies voltage, polarity and ground, then it will connect power, that and the surge protection is what you need.
The problem I have, they can't be mounted horizontally, so I have to figure out a way to mount it under the refer.